--- viewer/svutil.h.orig	Thu Feb 16 18:59:48 2017
+++ viewer/svutil.h	Fri Apr 28 20:26:55 2017
@@ -42,6 +42,11 @@
 #else
 #include <pthread.h>
 #include <semaphore.h>
+#ifdef __OpenBSD__
+#include <unistd.h>
+#include <sys/types.h>
+#include <netinet/in.h>
+#endif
 #endif
 
 #include <string>
